International law is clear, but sadly, so is a 500-year-old history of dam explosions as acts of war by all powers.

But its government chose to ignore the warning.

The 1987 treaty was not perfect, but President Trump is unlikely to secure a better deal that can make the world safer.

Past experience.

The proliferation of conventional weapons is out of control and incredibly deadly.

The freeze-for-freeze deal suggested by China and Russia can avert a deadly showdown between the US and North Korea.

Current defence systems in place might not be fully effective against a North Korea attack.

The many ways in which the assassination of the North Korean leader could lead to a total disaster.

The US has made clear it has not declared war on North Korea. But Pyongyang can still trigger military confrontation.

Despite Pyongyang’s indifference to the suffering of its own people, further sanctions could still prevent all out war.